Coupling for tubes



not in any Patented im. 1s, `1949 Jenn N. Wolfram, cleveland, ohio,assigner to The Parker Appliance Company, Cleveland,

Ohio, a corporationof Ohio Application Januars, 1945, serial No.572,026;y

(ci. 28s- 122) 2 Claims.

The invention relates to new and useful improvements in a coupling'fortubes and more particularly a tube having the end thereof flared orenlarged.

An objectv of the invention is to provide a coupling, wherein the tubeis secured to the coupling by metal disks forced by the nut intogripping engagement with the tube and wherein a. sealing gasket is5deformed byfthe closing of the coupling so as to provide a tight sealbetween the coupling and the tube. A L

In the drawings- .4 Figure 1 is a longitudinal sectional view through acoupling with the tube assembled therein and the clamping nut infinger-tight en-` gagement with the body member.

Figure 2 is a similar 'view but showing the coupling closed and the tubegripped and sealed to the coupling.

The coupling embodying the improvements includes a body member I havingthe usual bore 2 therethrough. The body member is counter,- bored asindicated at 3, andl also is provided with a thread l. Adapted to besecured to the body member is a nut 5 having a thread 8 which cooperateswith the thread on the body member.

the tube, and the end ofthe tube ared and lnserted in the chamber formedby the counterbore 3 of the body member. 4The nut is also engaged'withthe threads on the body member and 1 flngertightened. When the nut isturned further onto the body member the iiange 'I bearing against thering Il' will presssaidv ring against the gasket, the gasket in turnagainst the ring I2, andthe ring I2 againstthe end of thebody member.The continued turning f the nut will change th'ese truste-conicalshaped-disk mem- The nut at its outer end hasan inwardly extendinglamping flange 'I with an opening 8 therethrough. The tube extendsthrough this opening into the coupling.

' The tube which is joined to the coupling is indicated at 2. The innerend of the tube is en'- wardly. The counterbore 3 provides a chamberwhich receives the inner enlarged end of the tube. This counterbore isnotnecessarily accurately dimensioned as the chamber is merely a spaceto receive the end of the tube and the tube is way clamped against thebody member.

Betweenthe flange 1 and the inner endv Il of the body member is anannular recess. In this annular recess is placed a disk ,l2 offrusta-conical shape. Also disposed in the annular recess is a. ringgasket i3. This ring gasket is located between the metal disk I2 and theflange 1. Preferably there is also a second metal disk I4 which likewiseis of truste-conical shape. The inner diameter of these ring disks I2and il is initially slightly larger than the outer diameter v larged ati0, and, as illustrated, it is flared outbers into at ring members, asshown in Figure 2, disposed substantially at right angles to the surfaceofthe tube and the inner surfaceoi' the v nut. The ring I2, for example,at its outer periphery contacts with the end of the body member,` and atits inner side contacts with the -gasket, so that thel movement of thegasket toward the body member brings about this flatteningj of the ring.The same is true of the ring I4. The disks are so dimensioned so thatwhen turned into a flat arrangement said disks will grip the tube. Thesedisks, however, do not grip the nut, so that the nut is vfree to turn.The pressure in the nut against the' outer disk, and the outer diskagainst the ring gasket, will deform the gasket into firm grippingcontact with the.

tubeand also into sealing contact with the nut. The ring I2 will also beforced against the end of the body member and makea metal-to-metal sealtherewith. The elastic ring gasket I3 will be deformed so as to firmlygrip the tube.

When the coupling is closed the tube will not only be gripped Iby thedeformed' elastic gasket but also by the metal disks and will be firmlyheld' in the coupling.

It'will be noted that the metal disks I2 and it form a. closed recess inwhich the elastic gasket is confined so that there is no liability ofthe gasket being extruded from the recess due to fluid pressure on theline or due to pull out strains on the tube. Fluid pressure on the linebearing against the on the tube and also the grip of the metal rings on-the tube help resist the movement of the tube from the coupling. If thetube does move of the tube, and 'the same` is true of the` ring gasketI3. The disks, the ring gasket, and the -V nut are slipped ontothe tubebefore the end of the tube is flared.

In Figure 1 the parts are shown assembled on the end of until the flaredend I0 thereof engages the metal ring I2, the rubber gasket, which isincompressible, will act as a trapped fluid column and prevent the ringI2 from being pulled away from the body member so as to destroy theseal. y

It will be noted that theflared endl I0 of the n elastic gasket willtend to 'deform it radiallyso as to increase the tightness of the seal.The grip of the rubber sealing gask'et fore it is not necessary to ilarethe tube with any great accuracy, as in the case of couplings where thetube is held by the gripping of ythe ,ared end thereof.

It is obvious that minor changes in the details of construction maybemade without departing from the spirit of the invention as set forth inthe appended claims.

What is claimed is:

1. A coupling for rtubes having an enlarged end comprising abody member,a nut having a end comprising a body member, a nut having a threadedengagement therewith, said body member having a counterbore adapted toreceive the I, enlarged end of the tube, said nut having a threadedengagement therewith,said body member having a. counterbore adapted toreceive the enlarged end of the tube, said nut having a flange at itsouter end spaced away from the end of the body member and forming anannular recess within the nut, an annular metal ring surrounding saidtube and disposed between the end of the body member and the ange of thenut, a deformable ring 'gasket surrounding the tube and disposed betweensaid ring and the flange of the nut, said metal ring being initiallyfrustoconical shaped with the. outer portion thereof in engagement withthe body member and the flange at its outer end spaced away from the endof the body member and forming an annular recess within the nut, anannular metal ring surrounding said tube and disposed between the end ofthe body member and the flange of the nut, a. deformable ring gasketsurrounding the tube and disposed between said ring and the flange ofthe nut; a second annular metal ring of frust-conical shape disposedbetween the deformable ring lgasket and the flange of the nut Aso thatthe turning of the nut onto the body member will cause the metal ringsto flatten into substantially parallel planes at right angles -to thewall of the tube, said rings being dimensioned so as to make grippingcontact with the tube when inner portion of said ringin engagement withthe gasket whereby the turning of the nut onto the body member willcause said ring to atten into a plane substantially at right angles tothe wall of the tube, said ring being dimensioned so as to make grippingcontact with the tube when in flattened position and also cause the ringgasket to be deformed into tight sealing contact with the tube.

.2. A coupling for tubes having anenlarged in flattened position andalso cause the ring gasket to be deformed into tight sealing contactwith the tube.

\ JOHN N. WOLFRAM.

, REFERENCES CITED file of this patent:

UNITED STATES PATENTS Number l Name Date 1,381,931 Ostrander June 21,1921 1,440,207 Burns Dec. 26, 1-922 2,032,720 Sander 1 Mar. 3, 19'362,211,776 Haury Aug. 20, 1940 2,341,164

The .following references are of record in the Shimek Feb. 8, 1944

